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Common Three-lobed Coneflower,
Rudbeckia triloba var. triloba
Involucral bracts linear, 5-12mm long, spreading to reflexed, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Woodland Black-eyed Susan,
Rudbeckia hirta var. hirta
Involucral bracts linear to lanceolate, acute, spreading pubescent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Smooth Coneflower,
Echinacea laevigata
Involucral bracts obscurely in 2 series, acute to acuminate, reflexed, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Silver Seaside Oxeye,
Borrichia frutescens
Involucres hemispheric, flattened with age; bracts imbricate, apices aristate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Narrowleaf Sunflower,
Helianthus angustifolius
Involucral bracts in several series, lanceolate to linear, acuminate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Downy Sunflower,
Helianthus mollis
Involucral bracts lanceolate, acuminate, the tips often reflexed, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Woodland Sunflower,
Helianthus divaricatus
Involucral bracts lanceolate, acuminate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Thinleaf Sunflower,
Helianthus decapetalus
The floral bracts are unusually long and slender, per www.illinoiswildflowers.info.
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Small Wood Sunflower,
Helianthus microcephalus
Involucres 0.7-1cm long, bracts lanceolate, usually spreading apically, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Hairy Sunflower,
Helianthus resinosus
Involucres 3-5cm broad; bracts lanceolate, acuminate, spreading, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Roughleaf Sunflower,
Helianthus strumosus
Overlapping, spreading, narrow and pointed bracts with hairy margins, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Common Sunflower,
Helianthus annuus
Involucral body 2-10cm+ broad; bracts ovate abruptly long-acuminate, spreading, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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White Crownbeard,
Verbesina virginica var. virginica
Involucre of 1-2 series of lanceolate, erect, pubescent bracts, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Savanna Honeycomb-head,
Balduina uniflora
Resembles Helenium vernale but receptacle bracts persistent, honeycomb-like, per Wildflowers of the Eastern United States (Duncan & Duncan, 1999).
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Lanceleaf Coreopsis,
Coreopsis lanceolata
Outer involucral bracts green, lanceolate; inner elliptic to lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Large-flowered Coreopsis,
Coreopsis grandiflora var. grandiflora
Outer involucral bracts green, lanceolate; inner eliptic to lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Hairy Coreopsis,
Coreopsis pubescens var. pubescens
Calyculi [outer involucral bracts] of lanceolate to lance-linear bractlets, per Flora of North America.
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Eared Coreopsis,
Coreopsis auriculata
Outer bracts lanceolate, 6-10 mm long; inner lanceolate to elliptic, 7-13mm, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Whorled Coreopsis,
Coreopsis major var. major
Outer involucral bracts oblong or oblanceolate, 2-10mm; inner lanceolate 5-8mm, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Whorled Coreopsis,
Coreopsis major var. rigida
Outer involucral bracts oblong or oblanceolate, 2-10mm; inner lanceolate 5-8mm, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Tall Coreopsis,
Coreopsis tripteris
The inner involucral bracts not yet open, flower heads sealed up like pillboxes.
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Tall Coreopsis,
Coreopsis tripteris
Outer involucral bracts linear, 3-6mm long: inner lanceolate, 4-7mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Broadleaf Coreopsis,
Coreopsis latifolia
Outer involucral bracts linear, 4-6mm long: inner lanceolate, 7-8mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Nodding Bur-marigold,
Bidens cernua
Outer involucral bracts leafy, typically surpassing the disk, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Purplestem Beggarticks,
Bidens connata
3-8 green, leafy, glabrous, oblanceolate, elliptic, or oblong bracts, per www.illinoiswildflowers.info.
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Devil's Beggarticks,
Bidens frondosa
Outer bracts 5-8, rarely an individual head w more, usually sparsely ciliate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Devil's Beggarticks,
Bidens frondosa
About 8 leafy outer bracts, which greatly exceed the disk, per Wildflowers of the Southern Mountains (Smith, 1998).
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Devil's Beggarticks,
Bidens frondosa
Each flower head surrounded by 5-9 narrow leaflike bracts, per Newcomb's Wildflower Guide (Newcomb, 1977).
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Ditch Daisy,
Bidens aristosa
Calyculus bractlets [outer involucral bracts] usually spreading to reflexed, per Flora of North America.
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Ditch Daisy,
Bidens aristosa
Outer involucral bracts shorter than the inner, fewer than B. polylepis, per Wildflowers of Tennessee (Carman, 2005).
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Ditch Daisy,
Bidens aristosa
8-12(16) calyculus bractlets [outer involucral bracts], linear, per Flora of North America.
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Ditch Daisy,
Bidens polylepis
Outer involucral bracts curled and twisted, and longer than inner bracts, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Ditch Daisy,
Bidens polylepis
12-21 calyculus bractlets [outer involucral bracts], these (6)8-12(20)mm long, per Weakley's Flora.
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Ditch Daisy,
Bidens polylepis
There are 12 or more outer involucral bracts, longer than inner ones, per Wildflowers of the Southern Mountains (Smith, 1998).
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Spanish Needles,
Bidens bipinnata
Outer bracts green, 2-7mm long, very narrow; inner 4-8mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Sneezeweed,
Helenium autumnale
Involucre of one series of linear bracts, 5-10mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Savannah Sneezeweed,
Helenium vernale
Involucre of one series of linear bracts, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Bitterweed,
Helenium amarum
Involucre one series of linear bracts, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Oxeye Daisy,
Leucanthemum vulgare
Involucral bracts often w a dark line inside the hyaline [translucent] margin, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Coltsfoot,
Tussilago farfara
Cauline leaves lance-ovate to linear, bractlike or scale-like, per Flora of North America.